Typically, the main jet adjustment is part of the electric fuel shutoff solenoid. What's there now, a simple plug? A similar carb I worked on recently had a adjustment needle valve assembly installed where the solenoid should have been. That would be the RIGHT thing to do, if you feel it's necessary to remove the solenoid.
It APPEARS Deere part #RE19406, @ about $12.00 is a the manual adjustment screw assembly to replace the $185.00 solenoid.
Also, there may be something wrong in the venturi area, or little passages in the bottom 1/2 of the carb, leading up to the idle circuit up in the top. There are several passages that lead into the area where the throttle plate closes against the bore that may be clogged, adding to the "will not accelerate" problem. (Idle transfer passages.)
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Today's Featured Article - Massey Ferguson 35 (and up) Tractor Assembly Notes - by Jack Wetmore. These assembly notes are for Massey Ferguson tractors with a two stage clutch and 6 speed, 8 speed and mutli-power transmissions. I see a lot of discussion forum messages regarding damaged clutches from improper assembly. The objective is to have the engine and transmission slide together safely and easily until the gap between the two halves is less than 1/4", BEFORE tightening any of the bolts holding the two together. Using bolts to draw the two halves together will damage the PTO
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